It's good to know what your other guilds in the server are capable. No harm done by checking in on their progression so you can alter your plans to handle them.

You need to have a plan to be able to pull off a successful siege especially if you are in a full server. There will be a lot of times where a guild could steal your spot at the top and leave you with less than a minute to take everything back. Think this over with your guild on the best placement you want to use for your guild members

It is best to split your guild into 3 parts. One stationed in the throne room in chariots and in the middle and then a few of your heavy hitters at the main front gate to fend off any attacker not in a chariot. This will help to manage the amount of other guilds that get through your main gate

As you can see from the picture here here, you can get an absolute ton of wing materials and other useful resources such as Jewel of Creation, Awakening Jewels, Gear pieces, Skill Shards and some of the best weapons in the game being the Archangel weapons, both blessed and regular.

As you start winning more and more you will find that you are now on a streak. Every 3rd win will reward you with an additional chest you can offer to your guild to bid on. This chest will cost the same as the rest and off a regular Archangel Weapon